Getting infected by TB has no relation with gall bladder surgery
The fact that you are having recurrent infections and discharge from the operative site might be a manifestation of abdominal TB
If you had loss of weight then it clinges to the diagnosis more
You can get abdominal TB either primarily or secondary to chest infection
Next Steps
to get some preliminary tests done to rule out tb you can go ahead with
mantoux test, esr, sputum for AFB (3 early morning samples) and chest x ray
consult a general physician also so that he can examine and rule out any other symptoms and signs of TB
hope this helps you out